this table has more than 400,000 data that is not indexed
uname datetime
and composite indexes.
I don"t know how to ask all of you for beginners
this table has more than 400,000 data that is not indexed
uname datetime
and composite indexes.
I don"t know how to ask all of you for beginners
for columns with a lot of duplicate data, it is not suitable to simply build an index, because the amount of data after Filter is still very large, and the index is walking through the table first, so it is very slow
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I configured the MIME type of the file with the amr suffix in the apache configuration as application ms-download, Why it is a garbled page when opening a file in amr format using window.open in chrome, while a file in amr format can be successfully dow...
what does the code circled in the following picture mean? ...
rewrite rules: RewriteRule (.*) (.*) (.*) index .html index.php?p=$1&c=$2&a=$3 [QSA] access Home Blog blog index.html?page=2 can access index.php?p=Home&c=Blog&c=blog&page=2 normally but when the original link is index.php?p=Home&c=Blog&a...
$selectTip = $pdo->query("SELECT * FROM `tips_rate` WHERE `tip_id` = ".$row[ id ]." " ); $selecttotal = mysqli_num_rows($selectTip); $rate = $pdo->query("SELEC...
the following is the back-end code I think $username= is a randomly generated string in the output, so write $username=$number; like this, but this is an execution error, how to do it? For advice, thank you <?php $username=$_POST[ username ]; $nu...
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In apache,event mode, 8 processes are started. Set to perform 10000 automatic recreations. On the next day, there were only two hundred and three processes. is this the number of processes that apache thinks there are not enough tasks and automaticall...
$first is the data read by the database as shown in figure : read through the database can not change the line, directly written in the code can break the line, solve =! ...
as shown in the figure, the generated url does not have a domain name. Where do I need to configure it? ...
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1. Background of the problem: recently, it has been almost exclusively said on php7, that only php7 compiled with GCC 4.8 will open Global Register for opline and execute_data . 2. Question description: Q: what is 1Global Register for opline and e...
the query data is printed to see that _ id is objectID,. If it is directly converted to json,_id, it will be empty. Can you change objectID to string, and then to json? ...
$result= array(); foreach ($infos as $key => $info) { $result[$info[ time ]][] = $info;}; $results=array_slice($result,0,255); in this code, I want to use array_slice to remove the key value of $result, but I don t use . ...
stateful fields are often saved in the database, which are represented by numbers: 0-> fail reject 1-> success pass and so on, I want to convert 0 or 1 into Chinese characters in the obtained results, is there any good way to quickly complete t...